"today in the bay's" christie smith live in walnut creek. she has more details and how it will be affecting riders. >>> kristy, good morning. >>> ntsb investigators are going to be out here on the tracks reenacting the accident about the same time it happened on saturday. what that means for b.a.r.t. riders, they are going to have to use a bus bridge to get around this section of track. standing here, these flowers, it is kind of erie how you don't hear much. suddenly, a b.a.r.t. train flies by. on saturday, a train was going about 60-70 miles an hour when it hit christopher sheppard and lawrence daniel while they were working. the responsibility of safety was on the workers themselves. they had radioed the dispatcher to say they were out here working on the tracks. the ntsb says that the worker, one of them, was to inspect the tracks. the other was to act as a lookout, to watch out. he should have not been where he could have been hit. the horn did sound, lights and brakes all the functioning on it's train. today, the ntsb is trying to fill